I'm creating a map of Pakistan based on availability of satisfactory water supply at a district level.
Since it is difficult to collect reliable data for all districts, I would like for the final map to show whitespace where the column Condition is unavailable. My SPDF is named pak.
tm_shape(pak) + tm_polygons("Condition", palette = "-Reds")
Above is the command I am using presently to get the following output. I would essentially like for the grey space to not be plotted at all (not even the borders).